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ND54-GR515 vs ND66-GK725 (IEC1500V) 7 of 18 identical Swap Change panels

TCL Zhonghuan HSM-ND54-GR515 vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)

TCL Zhonghuan
HSM-ND54-GR515
515 Wp 23.20 % TOPCon Bifacial
Open panel page Datasheet PDF
VS
TCL Zhonghuan
HSM-ND66-GK725 (IEC1500V)
725 Wp 23.30 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
The verdict

11 differences, and they point both ways

The largest is rated power: 210 W more power. 7 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 11 differences
How alike are they
7 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

11 of 18 parameters
Parameter ND54-GR515 ND66-GK725 (IEC1500V) Difference
Rated power 515 Wp 725 Wp 210 W more power
Weight 27.0 kg 38.2 kg 11.2 kg lighter
Product warranty 25 yrs 15 yrs 10 yrs longer
Open-circuit voltage 40.58 V 49.36 V 8.78 V apart
Short-circuit current 16.02 A 18.60 A 2.58 A apart
Module area 2.224 m² 3.106 m² 0.883 m² apart
Temperature coefficient -0.290 %/°C -0.280 %/°C 0.010 %/°C better in heat
Voltage at max power 34.30 V 41.27 V 6.97 V apart
Current at max power 15.03 A 17.57 A 2.54 A apart
Cell count 108 132 24 cells apart
Dimensions 1961x1134x30 mm 2384x1303x33 mm 1961x1134x30 mm vs 2384x1303x33 mm
02

What it means on a roof

Thirty years of production
Declared first-year losses, with 0.40% a year afterwards assumed for both panels, at 1,200 kWh/kWp a year
ND54-GR515
17,279 kWh
ND66-GK725 (IEC1500V)
24,325 kWh
Lifetime gap
7,046 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario ND54-GR515 ND66-GK725 (IEC1500V)
Standard test conditions 25 °C 100.0% of rated power 515 W 725 W
Cool, bright day 40 °C 95.7% of rated power 493 W 695 W
Typical summer roof 55 °C 91.3% of rated power 470 W 664 W
Hot roof 70 °C 87.0% of rated power 448 W 634 W
03

Full specification

Parameter ND54-GR515 ND66-GK725 (IEC1500V) Difference
Power and efficiency
Rated power 515 Wp 725 Wp +210 W for ND66-GK725 (IEC1500V)
Module efficiency 23.20 % 23.30 % Effectively the same
Power density 231.6 Wp/m² 233.4 Wp/m² Effectively the same
Open-circuit voltage 40.58 V 49.36 V 8.78 V apart
Voltage at max power 34.30 V 41.27 V 6.97 V apart
Short-circuit current 16.02 A 18.60 A 2.58 A apart
Current at max power 15.03 A 17.57 A 2.54 A apart
Temperature
Temperature coefficient -0.290 %/°C -0.280 %/°C +0.010 %/°C for ND66-GK725 (IEC1500V)
Mechanical
Dimensions 1961x1134x30 mm 2384x1303x33 mm 1961x1134x30 mm vs 2384x1303x33 mm
Module area 2.224 m² 3.106 m² 0.883 m² apart
Weight 27.0 kg 38.2 kg -11.2 kg for ND54-GR515
Weight per kWp 52.4 kg/kWp 52.7 kg/kWp Effectively the same
Warranty and degradation
Product warranty 25 yrs 15 yrs +10 yrs for ND54-GR515
Performance warranty 30 yrs 30 yrs Same
Annual degradation 0.40 %/yr - Not published by TCL Zhonghuan
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 108 132 24 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,306 vs #1,017
ND66-GK725 (IEC1500V) leads by 289 places
Power density
#1,473 vs #936
ND66-GK725 (IEC1500V) leads by 537 places
Heat behaviour
#2,165 vs #1,309
ND66-GK725 (IEC1500V) leads by 856 places
Weight
#5,919 vs #6,337
ND54-GR515 leads by 418 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#3,194 vs #266
ND66-GK725 (IEC1500V) leads by 2,928 places
05

More useful comparisons

Open the full database
Same series, other bin
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TCL Zhonghuan HSM-ND54-GR515 vs TCL Zhonghuan HSM-ND54-GR510
One difference: module efficiency
Same series, other bin
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TCL Zhonghuan HSM-ND54-GR515 vs TCL Zhonghuan HSM-ND54-GR505
3 differences, the largest is module efficiency
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TCL Zhonghuan HSM-ND54-GR515 vs TCL Zhonghuan HSM-ND54-GR500
3 differences, the largest is module efficiency
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TCL Zhonghuan HSM-ND54-GR515 vs TCL Zhonghuan HSM-ND54-GR495
4 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND54-GR515 vs TCL Zhonghuan HSM-ND54-GR490
6 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725
One difference: cell technology
06

Written summary

07

Questions about this pairing

Which panel is better: TCL Zhonghuan HSM-ND54-GR515 or TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)?
According to our database: TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) has higher module efficiency (23.30% vs 23.20%); TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) tolerates heat better (temp coeff -0.280%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of TCL Zhonghuan HSM-ND54-GR515 and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)?
TCL Zhonghuan HSM-ND54-GR515 has a module efficiency of 23.20%, while TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) is 23.30%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does TCL Zhonghuan HSM-ND54-GR515 use vs TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)?
TCL Zhonghuan HSM-ND54-GR515 uses TOPCon cells; TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on TCL Zhonghuan HSM-ND54-GR515 and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V)?
TCL Zhonghuan HSM-ND54-GR515 has a 30 years power warranty; TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.
Are TCL Zhonghuan HSM-ND54-GR515 and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) bifacial panels?
Both TCL Zhonghuan HSM-ND54-GR515 and TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.